APA (7th ed.) Citation

Cross, F. B., & Olund, L. J. (2011). Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cross, Frank B., and Leonard J. Olund. Geographic Variation in the North American Cyprinid Fish, Hybopsis Gracilis. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Cross, Frank B., and Leonard J. Olund. Geographic Variation in the North American Cyprinid Fish, Hybopsis Gracilis. Project Gutenberg, 2011.

Warning: These citations may not always be 100% accurate.